I went through four rounds of interviews over more than a month. Throughout the process, the recruiter kept asking for my "key takeaways" after each round, which grew frustrating because with that many rounds, the conversations were repetitive. After all of that, I never heard back, even after following up twice. For a company that puts candidates through such a long and involved process, the least they can offer in return is the basic courtesy of a response. You should avoid this place if you aren't desperate.